If you thought Sherlock star Benedict Cumberbatch had become 'big' in Britain, his turn as Khan in the recent Star Trek sequel, as well as his current outing as Julian Assange in The Fifth Estate has sent the 37-year-old London-born actor stratospheric in the US.

And his growing stateside reputation wasn’t harmed on Thursday when he appeared on Late Night With Jimmy Fallon, exchanging Alan Rickman impressions with the host.